| http://www.w3.org/ns/prov#value | - A luminescent material whose empirical formula is M'.sub.(2-x) Mx O2 CH where: M' is at least one member of the group consisting of La and Lu, M is a member of the group consisting of Dy, Er, Eu, Ho, Nd, Pr, Sm, Tb, and Tm, O is oxygen, Ch is at least one member of the group consisting of S, Se, and Te, and x is between 0.0002 and 0.2. 5.
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